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Imperial 12 Station starts over

I recently bought a house with a very old Imperial Valet 11 station controller. Recently, after completing a cylce, the whole thing starts over again! Any ideas on why this is happening and how to prevent it?

Actually, it didn't need a new clock. The problem was that I had the cycle running for under an hour and so the cycle began again. I extended the cycle to over an hour and no problems since. Seems like you should be able to run a cycle that lasts less than an hour, though.